Perhaps you should try some spelling variations:
"support from integrationstheorie 2." » "support der integrationstheorie 2.", "support eine integrationstheorie 2.", "support from integrationstheorie fur.", "support from integration theories.", "support from interpretationstheorie 2."
"supply payment integration social." » "supply segment integration social.", "supply market integration social.", "supply payment information social.", "supply payment international social.", "survey payment integration social.", "support payments integration social."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply payment integration social.") or ("support from integrationstheorie 2."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply payment integration social.") OR ("support from integrationstheorie 2.")).
• Removing quotes may allow a broader search: (( supply payment integration social. ) or ( support from integrationstheorie 2. )).
• Adding a wildcard symbol may retrieve word variants: (("supply payment integration social.") or ("support from integrationstheorie 2."))*.